"The journey is far from over though," he added. "This is just the beginning! #healthylifestyle #sober #nomoredadbod! Let's go! If I can do it so can you!!"
McLean, who has spent time in rehab since 2001, spoke on the Recovering from Reality podcast in January last year, describing himself as a "chronic relapser".
"I can do short bursts and I'm OK," he explained. "Even when I would relapse, I wouldn't go on a bender."
At the time he said he'd "never gone for, like, a month straight of just drinking and partying," adding, "It's been, like, one night and then I'm sober for a week or two. And then it's one night. It was always back and forth."
The following year, he revealed on the Not Skinny But Not Fat podcast that he was almost 11 months sober.
"It's not been easy," he said in July.
"This two-year break that we all had really did a number on me in the right way. It gave me a chance to really reflect and really take this as [seriously] as I possibly can."
He's now focused on raising his daughters Elliott, 9, and Lyric, 5, with his wife Rochelle McLean.
The couple made headlines when they revealed their oldest daughter's new name last month, as Rochelle clarified that changing it from Ava to Elliott was "not a gender thing".
"Last year she asked us to start calling her Elliott and it stuck. She wanted something unique that no one else had."
